APK的安装方式主要有以下几种：
- 通过adb命令安装：adb 命令包括adb push/install
- 用户下载的Apk，通过系统安装器PackageInstaller安装该Apk。PackageInstaller是系统内置的应用程序，用于安装和卸载应用程序。
- 系统开机时安装系统应用。 persistent属性
- 应用商店下载后自动安装。
PackageInstaller的位置
frameworks\base\packages\PackageInstaller\路径下
其中InstallStart为PackageInstaller入口
<activity android:name=".InstallStart"
android:theme="@android:style/Theme.Translucent.NoTitleBar"
android:exported="true"
android:excludeFromRecents="true">
<intent-filter android:priority="1">
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.INSTALL_PACKAGE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="content" />
<data android:mimeType="application/vnd.android.package-archive" />
</intent-filter>
<intent-filter android:priority="1">
<action android:name="android.intent.action.INSTALL_PACKAGE" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="package" />
<data android:scheme="content" />
</intent-filter>
<intent-filter android:priority="1">
<action android:name="android.content.pm.action.CONFIRM_INSTALL" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>安装apk的代码主要是调用InstallStart
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(Uri.parse("file://" + path),"application/vnd.android.package-archive");
context.startActivity(intent);PackageInstaller是系统内置的应用程序，用于安装和卸载应用。当我们调用PackageInstaller来安装应用时会跳转到InstallStart，并调用它的onCreate方法：
String callingPackage = getCallingPackage();
final boolean isSessionInstall =
PackageInstaller.ACTION_CONFIRM_INSTALL.equals(intent.getAction());
if (isSessionInstall) {
nextActivity.setClass(this, PackageInstallerActivity.class);
} else {
Uri packageUri = intent.getData();
if (packageUri != null && packageUri.getScheme().equals(
ContentResolver.SCHEME_CONTENT)) {
// [IMPORTANT] This path is deprecated, but should still work. Only necessary
// features should be added.
// Copy file to prevent it from being changed underneath this process
//调用这里，启动InstallStaging
nextActivity.setClass(this, InstallStaging.class);
} else if (packageUri != null && packageUri.getScheme().equals(
PackageInstallerActivity.SCHEME_PACKAGE)) {
nextActivity.setClass(this, PackageInstallerActivity.class);
} else {
Intent result = new Intent();
result.putExtra(Intent.EXTRA_INSTALL_RESULT,
PackageManager.INSTALL_FAILED_INVALID_URI);
setResult(RESULT_FIRST_USER, result);
nextActivity = null;
}
}
if (nextActivity != null) {
startActivity(nextActivity);
}
finish();frameworks\base\packages\PackageInstaller\src\com\android\packageinstaller\InstallStaging.java InstallStaging的onResume方法
@Override
protected void onResume() {
super.onResume();
// This is the first onResume in a single life of the activity
if (mStagingTask == null) {
// File does not exist, or became invalid
if (mStagedFile == null) {
// Create file delayed to be able to show error
try {
如果File类型的mStagedFile 为null，则创建mStagedFile ，mStagedFile用于存储临时数据
mStagedFile = TemporaryFileManager.getStagedFile(this);
} catch (IOException e) {
showError();
return;
}
}
启动StagingAsyncTask
mStagingTask = new StagingAsyncTask();
mStagingTask.execute(getIntent().getData());
}
}StagingAsyncTask是InstallStaging的内部类，
private final class StagingAsyncTask extends AsyncTask<Uri, Void, Boolean> {
@Override
protected Boolean doInBackground(Uri... params) {
if (params == null || params.length <= 0) {
return false;
}
Uri packageUri = params[0];
try (InputStream in = getContentResolver().openInputStream(packageUri)) {
// Despite the comments in ContentResolver#openInputStream the returned stream can
// be null.
if (in == null) {
return false;
}
try (OutputStream out = new FileOutputStream(mStagedFile)) {
byte[] buffer = new byte[1024 * 1024];
int bytesRead;
while ((bytesRead = in.read(buffer)) >= 0) {
// Be nice and respond to a cancellation
if (isCancelled()) {
return false;
}
out.write(buffer, 0, bytesRead);
}
}
} catch (IOException | SecurityException | IllegalStateException e) {
Log.w(LOG_TAG, "Error staging apk from content URI", e);
return false;
}
return true;
}
@Override
protected void onPostExecute(Boolean success) {
if (success) {
// Now start the installation again from a file
Intent installIntent = new Intent(getIntent());
installIntent.setClass(InstallStaging.this, DeleteStagedFileOnResult.class);
installIntent.setData(Uri.fromFile(mStagedFile));
if (installIntent.getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
installIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
}
installIntent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivity(installIntent);
InstallStaging.this.finish();
} else {
showError();
}
}
}doInBackground方法中将packageUri（content协议的Uri）的内容写入到mStagedFile中，如果写入成功，onPostExecute方法中会跳转到DeleteStagedFileOnResult中，
frameworks\base\packages\PackageInstaller\src\com\android\packageinstaller\DeleteStagedFileOnResult.java
DeleteStagedFileOnResult启动PackageInstallerActivity实现apk的安装
public class DeleteStagedFileOnResult extends Activity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState == null) {
Intent installIntent = new Intent(getIntent());
installIntent.setClass(this, PackageInstallerActivity.class);
installIntent.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
startActivityForResult(installIntent, 0);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
File sourceFile = new File(getIntent().getData().getPath());
sourceFile.delete();
setResult(resultCode, data);
finish();
}
}DeleteStagedFileOnResult将mStagedFile传入PackageInstallerActivity，InstallStaging主要将content协议的Uri转换为File协议，然后跳转到PackageInstallerActivity，这样就可以像此前版本（Android7.0之前）一样启动安装流程了。
frameworks\base\packages\PackageInstaller\src\com\android\packageinstaller\PackageInstallerActivity.java
@Override
protected void onCreate(Bundle icicle) {
getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
super.onCreate(null);
if (icicle != null) {
mAllowUnknownSources = icicle.getBoolean(ALLOW_UNKNOWN_SOURCES_KEY);
}
//初始话安装所需要的各种对象
mPm = getPackageManager();
mIpm = AppGlobals.getPackageManager();
mAppOpsManager = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
mInstaller = mPm.getPackageInstaller();
mUserManager = (UserManager) getSystemService(Context.USER_SERVICE);
final Intent intent = getIntent();
mCallingPackage = intent.getStringExtra(EXTRA_CALLING_PACKAGE);
mSourceInfo = intent.getParcelableExtra(EXTRA_ORIGINAL_SOURCE_INFO);
mOriginatingUid = intent.getIntExtra(Intent.EXTRA_ORIGINATING_UID,
PackageInstaller.SessionParams.UID_UNKNOWN);
mOriginatingPackage = (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN)
? getPackageNameForUid(mOriginatingUid) : null;
final Uri packageUri;
if (PackageInstaller.ACTION_CONFIRM_INSTALL.equals(intent.getAction())) {
final int sessionId = intent.getIntExtra(PackageInstaller.EXTRA_SESSION_ID, -1);
final PackageInstaller.SessionInfo info = mInstaller.getSessionInfo(sessionId);
if (info == null || !info.sealed || info.resolvedBaseCodePath == null) {
Log.w(TAG, "Session " + mSessionId + " in funky state; ignoring");
finish();
return;
}
mSessionId = sessionId;
packageUri = Uri.fromFile(new File(info.resolvedBaseCodePath));
mOriginatingURI = null;
mReferrerURI = null;
} else {
mSessionId = -1;
packageUri = intent.getData();
mOriginatingURI = intent.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI);
mReferrerURI = intent.getParcelableExtra(Intent.EXTRA_REFERRER);
}
// if there's nothing to do, quietly slip into the ether
if (packageUri == null) {
Log.w(TAG, "Unspecified source");
setPmResult(PackageManager.INSTALL_FAILED_INVALID_URI);
finish();
return;
}
if (DeviceUtils.isWear(this)) {
showDialogInner(DLG_NOT_SUPPORTED_ON_WEAR);
return;
}
boolean wasSetUp = processPackageUri(packageUri);
if (!wasSetUp) {
return;
}
// load dummy layout with OK button disabled until we override this layout in
// startInstallConfirm
bindUi();
//判断是否是未知来源的应用，如果开启允许安装未知来源选项则直接初始化安装
checkIfAllowedAndInitiateInstall();
}| 类名 | 描述 |
|---|---|
| PackageManager | 用于向应用程序进程提供一些功能，最终的功能是由PMS来实现的 |
| IPackageManager | 一个AIDL的接口，用于和PMS进行进程间通信 |
| AppOpsManager | 用于权限动态检测,在Android4.3中被引入 |
| PackageInstaller | 提供安装、升级和删除应用程序功能 |
| UserManager | 用于多用户管理 |
bindUi();
/**
* Check if it is allowed to install the package and initiate install if allowed. If not allowed
* show the appropriate dialog.
*/
private void checkIfAllowedAndInitiateInstall() {
// Check for install apps user restriction first.
final int installAppsRestrictionSource = mUserManager.getUserRestrictionSource(
UserManager.DISALLOW_INSTALL_APPS, Process.myUserHandle());
if ((installAppsRestrictionSource & UserManager.RESTRICTION_SOURCE_SYSTEM) != 0) {
showDialogInner(DLG_INSTALL_APPS_RESTRICTED_FOR_USER);
return;
} else if (installAppsRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
startActivity(new Intent(Settings.ACTION_SHOW_ADMIN_SUPPORT_DETAILS));
finish();
return;
}
//判断如果允许安装未知来源或者根据Intent判断得出该APK不是未知来源
if (mAllowUnknownSources || !isInstallRequestFromUnknownSource(getIntent())) {
initiateInstall();
} else {
// 如果管理员限制来自未知源的安装, 就弹出提示Dialog或者跳转到设置界面
// Check for unknown sources restrictions.
final int unknownSourcesRestrictionSource = mUserManager.getUserRestrictionSource(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES, Process.myUserHandle());
final int unknownSourcesGlobalRestrictionSource = mUserManager.getUserRestrictionSource(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY, Process.myUserHandle());
final int systemRestriction = UserManager.RESTRICTION_SOURCE_SYSTEM
& (unknownSourcesRestrictionSource | unknownSourcesGlobalRestrictionSource);
if (systemRestriction != 0) {
showDialogInner(DLG_UNKNOWN_SOURCES_RESTRICTED_FOR_USER);
} else if (unknownSourcesRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
startAdminSupportDetailsActivity(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES);
} else if (unknownSourcesGlobalRestrictionSource != UserManager.RESTRICTION_NOT_SET) {
startAdminSupportDetailsActivity(
UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES_GLOBALLY);
} else {
handleUnknownSources();
}
}
}bindUi()方法主要完成对安装界面的加载
private void bindUi() {
mAlert.setIcon(mAppSnippet.icon);
mAlert.setTitle(mAppSnippet.label);
mAlert.setView(R.layout.install_content_view);
mAlert.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.install),
(ignored, ignored2) -> {
if (mOk.isEnabled()) {
if (mSessionId != -1) {
mInstaller.setPermissionsResult(mSessionId, true);
finish();
} else {
完成app的安装
startInstall();
}
}
}, null);
mAlert.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.cancel),
(ignored, ignored2) -> {
// Cancel and finish
setResult(RESULT_CANCELED);
if (mSessionId != -1) {
mInstaller.setPermissionsResult(mSessionId, false);
}
finish();
}, null);
setupAlert();
mOk = mAlert.getButton(DialogInterface.BUTTON_POSITIVE);
mOk.setEnabled(false);
if (!mOk.isInTouchMode()) {
mAlert.getButton(DialogInterface.BUTTON_NEGATIVE).requestFocus();
}
}
private void initiateInstall() {
String pkgName = mPkgInfo.packageName;
// Check if there is already a package on the device with this name
// but it has been renamed to something else.
String[] oldName = mPm.canonicalToCurrentPackageNames(new String[] { pkgName });
if (oldName != null && oldName.length > 0 && oldName[0] != null) {
pkgName = oldName[0];
mPkgInfo.packageName = pkgName;
mPkgInfo.applicationInfo.packageName = pkgName;
}
// Check if package is already installed. display confirmation dialog if replacing pkg
try {
// This is a little convoluted because we want to get all uninstalled
// apps, but this may include apps with just data, and if it is just
// data we still want to count it as "installed".
mAppInfo = mPm.getApplicationInfo(pkgName,
PackageManager.MATCH_UNINSTALLED_PACKAGES);
if ((mAppInfo.flags&ApplicationInfo.FLAG_INSTALLED) == 0) {
mAppInfo = null;
}
} catch (NameNotFoundException e) {
mAppInfo = null;
}
startInstallConfirm();
} private void startInstallConfirm() {
View viewToEnable;
if (mAppInfo != null) {
viewToEnable = (mAppInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0
? requireViewById(R.id.install_confirm_question_update_system)
: requireViewById(R.id.install_confirm_question_update);
} else {
// This is a new application with no permissions.
viewToEnable = requireViewById(R.id.install_confirm_question);
}
viewToEnable.setVisibility(View.VISIBLE);
mEnableOk = true;
mOk.setEnabled(true);
mOk.setFilterTouchesWhenObscured(true);
}具体加载的布局文件再frameworks\base\packages\PackageInstaller\res\layout\下
现在来总结下PackageInstaller初始化的过程：
- 根据Uri的Scheme协议不同，跳转到不同的界面，content协议跳转到InstallStart，其他的跳转到PackageInstallerActivity。
- InstallStart将content协议的Uri转换为File协议，然后跳转到PackageInstallerActivity。
- PackageInstallerActivity会分别对package协议和file协议的Uri进行处理，如果是file协议会解析APK文件得到包信息PackageInfo。
- PackageInstallerActivity中会对未知来源进行处理，如果允许安装未知来源或者根据Intent判断得出该APK不是未知来源，就会初始化安装确认界面，如果管理员限制来自未知源的安装, 就弹出提示Dialog或者跳转到设置界面。
startInstall();方法调用 InstallInstalling 来安装apk
startInstall方法用于跳转到InstallInstalling这个Activity，并关闭掉当前的PackageInstallerActivity。InstallInstalling主要用于向包管理器发送包的信息并处理包管理的回调。
private void startInstall() {
// Start subactivity to actually install the application
Intent newIntent = new Intent();
newIntent.putExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO,
mPkgInfo.applicationInfo);
newIntent.setData(mPackageURI);
newIntent.setClass(this, InstallInstalling.class);
String installerPackageName = getIntent().getStringExtra(
Intent.EXTRA_INSTALLER_PACKAGE_NAME);
if (mOriginatingURI != null) {
newIntent.putExtra(Intent.EXTRA_ORIGINATING_URI, mOriginatingURI);
}
if (mReferrerURI != null) {
newIntent.putExtra(Intent.EXTRA_REFERRER, mReferrerURI);
}
if (mOriginatingUid != PackageInstaller.SessionParams.UID_UNKNOWN) {
newIntent.putExtra(Intent.EXTRA_ORIGINATING_UID, mOriginatingUid);
}
if (installerPackageName != null) {
newIntent.putExtra(Intent.EXTRA_INSTALLER_PACKAGE_NAME,
installerPackageName);
}
if (getIntent().getBooleanExtra(Intent.EXTRA_RETURN_RESULT, false)) {
newIntent.putExtra(Intent.EXTRA_RETURN_RESULT, true);
}
newIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
if(localLOGV) Log.i(TAG, "downloaded app uri="+mPackageURI);
startActivity(newIntent);
finish();
}frameworks\base\packages\PackageInstaller\src\com\android\packageinstaller\InstallInstalling.java
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ApplicationInfo appInfo = getIntent()
.getParcelableExtra(PackageUtil.INTENT_ATTR_APPLICATION_INFO);
mPackageURI = getIntent().getData();
if ("package".equals(mPackageURI.getScheme())) {
try {
getPackageManager().installExistingPackage(appInfo.packageName);
launchSuccess();
} catch (PackageManager.NameNotFoundException e) {
launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);
}
} else {
//根据mPackageURI创建一个对应的File
final File sourceFile = new File(mPackageURI.getPath());
PackageUtil.AppSnippet as = PackageUtil.getAppSnippet(this, appInfo, sourceFile);
mAlert.setIcon(as.icon);
mAlert.setTitle(as.label);
mAlert.setView(R.layout.install_content_view);
mAlert.setButton(DialogInterface.BUTTON_NEGATIVE, getString(R.string.cancel),
(ignored, ignored2) -> {
if (mInstallingTask != null) {
mInstallingTask.cancel(true);
}
if (mSessionId > 0) {
getPackageManager().getPackageInstaller().abandonSession(mSessionId);
mSessionId = 0;
}
setResult(RESULT_CANCELED);
finish();
}, null);
setupAlert();
requireViewById(R.id.installing).setVisibility(View.VISIBLE);
//如果savedInstanceState不为null，获取此前保存的mSessionId和mInstallId
if (savedInstanceState != null) {
mSessionId = savedInstanceState.getInt(SESSION_ID);
mInstallId = savedInstanceState.getInt(INSTALL_ID);
// Reregister for result; might instantly call back if result was delivered while
// activity was destroyed
try {
//向InstallEventReceiver注册一个观察者
InstallEventReceiver.addObserver(this, mInstallId,
this::launchFinishBasedOnResult);
} catch (EventResultPersister.OutOfIdsException e) {
// Does not happen
}
} else {
PackageInstaller.SessionParams params = new PackageInstaller.SessionParams(
PackageInstaller.SessionParams.MODE_FULL_INSTALL);
params.setInstallAsInstantApp(false);
params.setReferrerUri(getIntent().getParcelableExtra(Intent.EXTRA_REFERRER));
params.setOriginatingUri(getIntent()
.getParcelableExtra(Intent.EXTRA_ORIGINATING_URI));
params.setOriginatingUid(getIntent().getIntExtra(Intent.EXTRA_ORIGINATING_UID,
UID_UNKNOWN));
params.setInstallerPackageName(getIntent().getStringExtra(
Intent.EXTRA_INSTALLER_PACKAGE_NAME));
params.setInstallReason(PackageManager.INSTALL_REASON_USER);
File file = new File(mPackageURI.getPath());
try {
PackageParser.PackageLite pkg = PackageParser.parsePackageLite(file, 0);
params.setAppPackageName(pkg.packageName);
params.setInstallLocation(pkg.installLocation);
params.setSize(
PackageHelper.calculateInstalledSize(pkg, false, params.abiOverride));
} catch (PackageParser.PackageParserException e) {
Log.e(LOG_TAG, "Cannot parse package " + file + ". Assuming defaults.");
Log.e(LOG_TAG,
"Cannot calculate installed size " + file + ". Try only apk size.");
params.setSize(file.length());
} catch (IOException e) {
Log.e(LOG_TAG,
"Cannot calculate installed size " + file + ". Try only apk size.");
params.setSize(file.length());
}
try {
mInstallId = InstallEventReceiver
.addObserver(this, EventResultPersister.GENERATE_NEW_ID,
this::launchFinishBasedOnResult);
} catch (EventResultPersister.OutOfIdsException e) {
launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);
}
try {
mSessionId = getPackageManager().getPackageInstaller().createSession(params);
} catch (IOException e) {
launchFailure(PackageManager.INSTALL_FAILED_INTERNAL_ERROR, null);
}
}
mCancelButton = mAlert.getButton(DialogInterface.BUTTON_NEGATIVE);
mSessionCallback = new InstallSessionCallback();
}
}onCreate方法中会分别对package和content协议的Uri进行处理，我们来看content协议的Uri处理部分。注释1处如果savedInstanceState不为null，获取此前保存的mSessionId和mInstallId，其中mSessionId是安装包的会话id，mInstallId是等待的安装事件id。注释2处根据mInstallId向InstallEventReceiver注册一个观察者，launchFinishBasedOnResult会接收到安装事件的回调，无论安装成功或者失败都会关闭当前的Activity(InstallInstalling)。如果savedInstanceState为null，代码的逻辑也是类似的，注释3处创建SessionParams，它用来代表安装会话的参数，注释4、5处根据mPackageUri对包（APK）进行轻量级的解析，并将解析的参数赋值给SessionParams。注释6处和注释2处类似向InstallEventReceiver注册一个观察者返回一个新的mInstallId，其中InstallEventReceiver继承自BroadcastReceiver，用于接收安装事件并回调给EventResultPersister。 注释7处PackageInstaller的createSession方法内部会通过IPackageInstaller与PackageInstallerService进行进程间通信，最终调用的是PackageInstallerService的createSession方法来创建并返回mSessionId。
@Override
protected void onResume() {
super.onResume();
// This is the first onResume in a single life of the activity
if (mInstallingTask == null) {
PackageInstaller installer = getPackageManager().getPackageInstaller();
PackageInstaller.SessionInfo sessionInfo = installer.getSessionInfo(mSessionId);
if (sessionInfo != null && !sessionInfo.isActive()) {
mInstallingTask = new InstallingAsyncTask();
mInstallingTask.execute();
} else {
// we will receive a broadcast when the install is finished
mCancelButton.setEnabled(false);
setFinishOnTouchOutside(false);
}
}
}根据mSessionId得到SessionInfo，SessionInfo代表安装会话的详细信息。如果sessionInfo不为Null并且不是活动的，就创建并执行InstallingAsyncTask。InstallingAsyncTask的doInBackground方法中会根据包(APK)的Uri，将APK的信息通过IO流的形式写入到PackageInstaller.Session中
onResune 启动InstallingAsyncTask
private final class InstallingAsyncTask extends AsyncTask<Void, Void,
PackageInstaller.Session> {
volatile boolean isDone;
@Override
protected PackageInstaller.Session doInBackground(Void... params) {
PackageInstaller.Session session;
try {
session = getPackageManager().getPackageInstaller().openSession(mSessionId);
} catch (IOException e) {
return null;
}
session.setStagingProgress(0);
try {
File file = new File(mPackageURI.getPath());
try (InputStream in = new FileInputStream(file)) {
long sizeBytes = file.length();
try (OutputStream out = session
.openWrite("PackageInstaller", 0, sizeBytes)) {
byte[] buffer = new byte[1024 * 1024];
while (true) {
int numRead = in.read(buffer);
if (numRead == -1) {
session.fsync(out);
break;
}
if (isCancelled()) {
session.close();
break;
}
out.write(buffer, 0, numRead);
if (sizeBytes > 0) {
float fraction = ((float) numRead / (float) sizeBytes);
session.addProgress(fraction);
}
}
}
}
return session;
} catch (IOException | SecurityException e) {
Log.e(LOG_TAG, "Could not write package", e);
session.close();
return null;
} finally {
synchronized (this) {
isDone = true;
notifyAll();
}
}
}
@Override
protected void onPostExecute(PackageInstaller.Session session) {
if (session != null) {
Intent broadcastIntent = new Intent(BROADCAST_ACTION);
broadcastIntent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND);
broadcastIntent.setPackage(getPackageName());
broadcastIntent.putExtra(EventResultPersister.EXTRA_ID, mInstallId);
PendingIntent pendingIntent = PendingIntent.getBroadcast(
InstallInstalling.this,
mInstallId,
broadcastIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
session.commit(pendingIntent.getIntentSender());
mCancelButton.setEnabled(false);
setFinishOnTouchOutside(false);
} else {
getPackageManager().getPackageInstaller().abandonSession(mSessionId);
if (!isCancelled()) {
launchFailure(PackageManager.INSTALL_FAILED_INVALID_APK, null);
}
}
}
}创建了一个PendingIntent，并将该PendingIntent的IntentSender通过PackageInstaller.Session的commit方法发送出去
frameworks\base\core\java\android\content\pm\PackageInstaller.java
protected final IPackageInstallerSession mSession;
public void commit(@NonNull IntentSender statusReceiver) {
try {
mSession.commit(statusReceiver, false);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}mSession的类型为IPackageInstallerSession，这说明要通过IPackageInstallerSession来进行进程间的通信，最终会调用PackageInstallerSession的commit方法
frameworks\base\services\core\java\com\android\server\pm\PackageInstallerSession.java
@Override
public void commit(@NonNull IntentSender statusReceiver, boolean forTransfer) {
if (hasParentSessionId()) {
throw new IllegalStateException(
"Session " + sessionId + " is a child of multi-package session "
+ mParentSessionId + " and may not be committed directly.");
}
if (!markAsSealed(statusReceiver, forTransfer)) {
return;
}
if (isMultiPackage()) {
final SparseIntArray remainingSessions = mChildSessionIds.clone();
final IntentSender childIntentSender =
new ChildStatusIntentReceiver(remainingSessions, statusReceiver)
.getIntentSender();
boolean sealFailed = false;
for (int i = mChildSessionIds.size() - 1; i >= 0; --i) {
final int childSessionId = mChildSessionIds.keyAt(i);
// seal all children, regardless if any of them fail; we'll throw/return
// as appropriate once all children have been processed
if (!mSessionProvider.getSession(childSessionId)
.markAsSealed(childIntentSender, forTransfer)) {
sealFailed = true;
}
}
if (sealFailed) {
return;
}
}
dispatchStreamValidateAndCommit();
}private void dispatchStreamValidateAndCommit() {
mHandler.obtainMessage(MSG_STREAM_VALIDATE_AND_COMMIT).sendToTarget();
}
private void handleStreamValidateAndCommit() {
PackageManagerException unrecoverableFailure = null;
// This will track whether the session and any children were validated and are ready to
// progress to the next phase of install
boolean allSessionsReady = false;
try {
allSessionsReady = streamValidateAndCommit();
} catch (PackageManagerException e) {
unrecoverableFailure = e;
}
if (isMultiPackage()) {
int childCount = mChildSessionIds.size();
// This will contain all child sessions that do not encounter an unrecoverable failure
ArrayList<PackageInstallerSession> nonFailingSessions = new ArrayList<>(childCount);
for (int i = childCount - 1; i >= 0; --i) {
final int childSessionId = mChildSessionIds.keyAt(i);
// commit all children, regardless if any of them fail; we'll throw/return
// as appropriate once all children have been processed
try {
PackageInstallerSession session = mSessionProvider.getSession(childSessionId);
allSessionsReady &= session.streamValidateAndCommit();
nonFailingSessions.add(session);
} catch (PackageManagerException e) {
allSessionsReady = false;
if (unrecoverableFailure == null) {
unrecoverableFailure = e;
}
}
}
// If we encountered any unrecoverable failures, destroy all other sessions including
// the parent
if (unrecoverableFailure != null) {
// {@link #streamValidateAndCommit()} calls
// {@link #onSessionVerificationFailure(PackageManagerException)}, but we don't
// expect it to ever do so for parent sessions. Call that on this parent to clean
// it up and notify listeners of the error.
onSessionVerificationFailure(unrecoverableFailure);
// fail other child sessions that did not already fail
for (int i = nonFailingSessions.size() - 1; i >= 0; --i) {
PackageInstallerSession session = nonFailingSessions.get(i);
session.onSessionVerificationFailure(unrecoverableFailure);
}
}
}
if (!allSessionsReady) {
return;
}
mHandler.obtainMessage(MSG_INSTALL).sendToTarget();
} private void handleInstall() {
if (isInstallerDeviceOwnerOrAffiliatedProfileOwnerLocked()) {
DevicePolicyEventLogger
.createEvent(DevicePolicyEnums.INSTALL_PACKAGE)
.setAdmin(mInstallSource.installerPackageName)
.write();
}
if (params.isStaged) {
mStagingManager.commitSession(this);
destroyInternal();
dispatchSessionFinished(PackageManager.INSTALL_SUCCEEDED, "Session staged", null);
return;
}
if (isApexInstallation()) {
destroyInternal();
dispatchSessionFinished(PackageManager.INSTALL_FAILED_INTERNAL_ERROR,
"APEX packages can only be installed using staged sessions.", null);
return;
}
// For a multiPackage session, read the child sessions
// outside of the lock, because reading the child
// sessions with the lock held could lead to deadlock
// (b/123391593).
List<PackageInstallerSession> childSessions = getChildSessionsNotLocked();
try {
synchronized (mLock) {
installNonStagedLocked(childSessions);
}
} catch (PackageManagerException e) {
final String completeMsg = ExceptionUtils.getCompleteMessage(e);
Slog.e(TAG, "Commit of session " + sessionId + " failed: " + completeMsg);
destroyInternal();
dispatchSessionFinished(e.error, completeMsg, null);
}
} @GuardedBy("mLock")
private void installNonStagedLocked(List<PackageInstallerSession> childSessions)
throws PackageManagerException {
final PackageManagerService.ActiveInstallSession installingSession =
makeSessionActiveLocked();
if (installingSession == null) {
return;
}
if (isMultiPackage()) {
List<PackageManagerService.ActiveInstallSession> installingChildSessions =
new ArrayList<>(childSessions.size());
boolean success = true;
PackageManagerException failure = null;
for (int i = 0; i < childSessions.size(); ++i) {
final PackageInstallerSession session = childSessions.get(i);
try {
final PackageManagerService.ActiveInstallSession installingChildSession =
session.makeSessionActiveLocked();
if (installingChildSession != null) {
installingChildSessions.add(installingChildSession);
}
} catch (PackageManagerException e) {
failure = e;
success = false;
}
}
if (!success) {
sendOnPackageInstalled(mContext, mRemoteStatusReceiver, sessionId,
isInstallerDeviceOwnerOrAffiliatedProfileOwnerLocked(), userId, null,
failure.error, failure.getLocalizedMessage(), null);
return;
}
mPm.installStage(installingChildSessions);
} else {
mPm.installStage(installingSession);
}
}调用 mPm的installStage方法
private final PackageManagerService mPm;frameworks\base\services\core\java\com\android\server\pm\PackageManagerService.java
void installStage(ActiveInstallSession activeInstallSession) {
if (DEBUG_INSTANT) {
if ((activeInstallSession.getSessionParams().installFlags
& PackageManager.INSTALL_INSTANT_APP) != 0) {
Slog.d(TAG, "Ephemeral install of " + activeInstallSession.getPackageName());
}
}
final Message msg = mHandler.obtainMessage(INIT_COPY);
final InstallParams params = new InstallParams(activeInstallSession);
params.setTraceMethod("installStage").setTraceCookie(System.identityHashCode(params));
msg.obj = params;
Trace.asyncTraceBegin(TRACE_TAG_PACKAGE_MANAGER, "installStage",
System.identityHashCode(msg.obj));
Trace.asyncTraceBegin(TRACE_TAG_PACKAGE_MANAGER, "queueInstall",
System.identityHashCode(msg.obj));
mHandler.sendMessage(msg);
}创建InstallParams，它对应于包的安装数据
void doHandleMessage(Message msg) {
switch (msg.what) {
case INIT_COPY: {
HandlerParams params = (HandlerParams) msg.obj;
if (params != null) {
if (DEBUG_INSTALL) Slog.i(TAG, "init_copy: " + params);
Trace.asyncTraceEnd(TRACE_TAG_PACKAGE_MANAGER, "queueInstall",
System.identityHashCode(params));
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "startCopy");
params.startCopy();
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
break;
}params.startCopy();
params是HandlerParams类
final void startCopy() {
if (DEBUG_INSTALL) Slog.i(TAG, "startCopy " + mUser + ": " + this);
handleStartCopy();
handleReturnCode();
} abstract void handleStartCopy();
abstract void handleReturnCode();具体实现在 InstallParams里 是PackageManagerService的内部类
class InstallParams extends HandlerParams {
public void handleStartCopy() {
int ret = PackageManager.INSTALL_SUCCEEDED;
// If we're already staged, we've firmly committed to an install location
if (origin.staged) {
if (origin.file != null) {
installFlags |= PackageManager.INSTALL_INTERNAL;
} else {
throw new IllegalStateException("Invalid stage location");
}
}
//确定APK的安装位置。 onInt：内部存储即Data分区，ephemeral：安装到临时存储（Instant Apps安装）
final boolean onInt = (installFlags & PackageManager.INSTALL_INTERNAL) != 0;
final boolean ephemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0;
PackageInfoLite pkgLite = null;
//获取APK的少量的信息
pkgLite = PackageManagerServiceUtils.getMinimalPackageInfo(mContext,
origin.resolvedPath, installFlags, packageAbiOverride);
if (DEBUG_INSTANT && ephemeral) {
Slog.v(TAG, "pkgLite for install: " + pkgLite);
}
/*
* If we have too little free space, try to free cache
* before giving up.
*/
if (!origin.staged && pkgLite.recommendedInstallLocation
== PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE) {
// TODO: focus freeing disk space on the target device
final StorageManager storage = StorageManager.from(mContext);
final long lowThreshold = storage.getStorageLowBytes(
Environment.getDataDirectory());
final long sizeBytes = PackageManagerServiceUtils.calculateInstalledSize(
origin.resolvedPath, packageAbiOverride);
if (sizeBytes >= 0) {
try {
mInstaller.freeCache(null, sizeBytes + lowThreshold, 0, 0);
pkgLite = PackageManagerServiceUtils.getMinimalPackageInfo(mContext,
origin.resolvedPath, installFlags, packageAbiOverride);
} catch (InstallerException e) {
Slog.w(TAG, "Failed to free cache", e);
}
}
/*
* The cache free must have deleted the file we downloaded to install.
*
* TODO: fix the "freeCache" call to not delete the file we care about.
*/
if (pkgLite.recommendedInstallLocation
== PackageHelper.RECOMMEND_FAILED_INVALID_URI) {
pkgLite.recommendedInstallLocation
= PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE;
}
}
if (ret == PackageManager.INSTALL_SUCCEEDED) {
//判断安装的位置
int loc = pkgLite.recommendedInstallLocation;
if (loc == PackageHelper.RECOMMEND_FAILED_INVALID_LOCATION) {
ret = PackageManager.INSTALL_FAILED_INVALID_INSTALL_LOCATION;
} else if (loc == PackageHelper.RECOMMEND_FAILED_ALREADY_EXISTS) {
ret = PackageManager.INSTALL_FAILED_ALREADY_EXISTS;
} else if (loc == PackageHelper.RECOMMEND_FAILED_INSUFFICIENT_STORAGE) {
ret = PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
} else if (loc == PackageHelper.RECOMMEND_FAILED_INVALID_APK) {
ret = PackageManager.INSTALL_FAILED_INVALID_APK;
} else if (loc == PackageHelper.RECOMMEND_FAILED_INVALID_URI) {
ret = PackageManager.INSTALL_FAILED_INVALID_URI;
} else if (loc == PackageHelper.RECOMMEND_MEDIA_UNAVAILABLE) {
ret = PackageManager.INSTALL_FAILED_MEDIA_UNAVAILABLE;
} else {
// Override with defaults if needed.
loc = installLocationPolicy(pkgLite);
if (loc == PackageHelper.RECOMMEND_FAILED_VERSION_DOWNGRADE) {
ret = PackageManager.INSTALL_FAILED_VERSION_DOWNGRADE;
} else if (loc == PackageHelper.RECOMMEND_FAILED_WRONG_INSTALLED_VERSION) {
ret = PackageManager.INSTALL_FAILED_WRONG_INSTALLED_VERSION;
} else if (!onInt) {
// Override install location with flags
if (loc == PackageHelper.RECOMMEND_INSTALL_EXTERNAL) {
// Set the flag to install on external media.
installFlags &= ~PackageManager.INSTALL_INTERNAL;
} else if (loc == PackageHelper.RECOMMEND_INSTALL_EPHEMERAL) {
if (DEBUG_INSTANT) {
Slog.v(TAG, "...setting INSTALL_EPHEMERAL install flag");
}
installFlags |= PackageManager.INSTALL_INSTANT_APP;
installFlags &= ~PackageManager.INSTALL_INTERNAL;
} else {
// Make sure the flag for installing on external
// media is unset
installFlags |= PackageManager.INSTALL_INTERNAL;
}
}
}
}
//根据InstallParams创建InstallArgs对象
final InstallArgs args = createInstallArgs(this);
mVerificationCompleted = true;
mIntegrityVerificationCompleted = true;
mEnableRollbackCompleted = true;
mArgs = args;
if (ret == PackageManager.INSTALL_SUCCEEDED) {
final int verificationId = mPendingVerificationToken++;
// Perform package verification (unless we are simply moving the package).
if (!origin.existing) {
PackageVerificationState verificationState =
new PackageVerificationState(this);
mPendingVerification.append(verificationId, verificationState);
sendIntegrityVerificationRequest(verificationId, pkgLite, verificationState);
ret = sendPackageVerificationRequest(
verificationId, pkgLite, verificationState);
// If both verifications are skipped, we should remove the state.
if (verificationState.areAllVerificationsComplete()) {
mPendingVerification.remove(verificationId);
}
}
if ((installFlags & PackageManager.INSTALL_ENABLE_ROLLBACK) != 0) {
// TODO(ruhler) b/112431924: Don't do this in case of 'move'?
final int enableRollbackToken = mPendingEnableRollbackToken++;
Trace.asyncTraceBegin(
TRACE_TAG_PACKAGE_MANAGER, "enable_rollback", enableRollbackToken);
mPendingEnableRollback.append(enableRollbackToken, this);
Intent enableRollbackIntent = new Intent(Intent.ACTION_PACKAGE_ENABLE_ROLLBACK);
enableRollbackIntent.putExtra(
PackageManagerInternal.EXTRA_ENABLE_ROLLBACK_TOKEN,
enableRollbackToken);
enableRollbackIntent.putExtra(
PackageManagerInternal.EXTRA_ENABLE_ROLLBACK_SESSION_ID,
mSessionId);
enableRollbackIntent.setType(PACKAGE_MIME_TYPE);
enableRollbackIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
// Allow the broadcast to be sent before boot complete.
// This is needed when committing the apk part of a staged
// session in early boot. The rollback manager registers
// its receiver early enough during the boot process that
// it will not miss the broadcast.
enableRollbackIntent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT);
mContext.sendOrderedBroadcastAsUser(enableRollbackIntent, UserHandle.SYSTEM,
android.Manifest.permission.PACKAGE_ROLLBACK_AGENT,
new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// the duration to wait for rollback to be enabled, in millis
long rollbackTimeout = DeviceConfig.getLong(
DeviceConfig.NAMESPACE_ROLLBACK,
PROPERTY_ENABLE_ROLLBACK_TIMEOUT_MILLIS,
DEFAULT_ENABLE_ROLLBACK_TIMEOUT_MILLIS);
if (rollbackTimeout < 0) {
rollbackTimeout = DEFAULT_ENABLE_ROLLBACK_TIMEOUT_MILLIS;
}
final Message msg = mHandler.obtainMessage(
ENABLE_ROLLBACK_TIMEOUT);
msg.arg1 = enableRollbackToken;
msg.arg2 = mSessionId;
mHandler.sendMessageDelayed(msg, rollbackTimeout);
}
}, null, 0, null, null);
mEnableRollbackCompleted = false;
}
}
mRet = ret;
}InstallArgs 是一个抽象类，定义了APK的安装逻辑，比如复制和重命名APK等，
其中FileInstallArgs用于处理安装到非ASEC的存储空间的APK，也就是内部存储空间（Data分区）
MoveInstallArgs用于处理已安装APK的移动的逻辑。
static abstract class InstallArgs {
class FileInstallArgs extends InstallArgs {
class MoveInstallArgs extends InstallArgs {@Override
void handleReturnCode() {
if (mVerificationCompleted
&& mIntegrityVerificationCompleted && mEnableRollbackCompleted) {
if ((installFlags & PackageManager.INSTALL_DRY_RUN) != 0) {
String packageName = "";
ParseResult<PackageLite> result = ApkLiteParseUtils.parsePackageLite(
new ParseTypeImpl(
(changeId, packageName1, targetSdkVersion) -> {
ApplicationInfo appInfo = new ApplicationInfo();
appInfo.packageName = packageName1;
appInfo.targetSdkVersion = targetSdkVersion;
return mPackageParserCallback.isChangeEnabled(changeId,
appInfo);
}).reset(),
origin.file, 0);
if (result.isError()) {
Slog.e(TAG, "Can't parse package at " + origin.file.getAbsolutePath(),
result.getException());
} else {
packageName = result.getResult().packageName;
}
try {
observer.onPackageInstalled(packageName, mRet, "Dry run", new Bundle());
} catch (RemoteException e) {
Slog.i(TAG, "Observer no longer exists.");
}
return;
}
if (mRet == PackageManager.INSTALL_SUCCEEDED) {
mRet = mArgs.copyApk();
}
processPendingInstall(mArgs, mRet);
}
}mArgs.copyApk();
private InstallArgs mArgs;
int copyApk() {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "copyApk");
try {
return doCopyApk();
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
}
private int doCopyApk() {
if (origin.staged) {
if (DEBUG_INSTALL) Slog.d(TAG, origin.file + " already staged; skipping copy");
codeFile = origin.file;
resourceFile = origin.file;
return PackageManager.INSTALL_SUCCEEDED;
}
try {
final boolean isEphemeral = (installFlags & PackageManager.INSTALL_INSTANT_APP) != 0;
//创建临时文件存储目录
final File tempDir =
mInstallerService.allocateStageDirLegacy(volumeUuid, isEphemeral);
codeFile = tempDir;
resourceFile = tempDir;
} catch (IOException e) {
Slog.w(TAG, "Failed to create copy file: " + e);
return PackageManager.INSTALL_FAILED_INSUFFICIENT_STORAGE;
}
将APK复制到临时存储目录
int ret = PackageManagerServiceUtils.copyPackage(
origin.file.getAbsolutePath(), codeFile);
if (ret != PackageManager.INSTALL_SUCCEEDED) {
Slog.e(TAG, "Failed to copy package");
return ret;
}
final boolean isIncremental = isIncrementalPath(codeFile.getAbsolutePath());
final File libraryRoot = new File(codeFile, LIB_DIR_NAME);
NativeLibraryHelper.Handle handle = null;
try {
handle = NativeLibraryHelper.Handle.create(codeFile);
ret = NativeLibraryHelper.copyNativeBinariesWithOverride(handle, libraryRoot,
abiOverride, isIncremental);
} catch (IOException e) {
Slog.e(TAG, "Copying native libraries failed", e);
ret = PackageManager.INSTALL_FAILED_INTERNAL_ERROR;
} finally {
IoUtils.closeQuietly(handle);
}
return ret;
}processPendingInstall(mArgs, mRet);
private void processPendingInstall(final InstallArgs args, final int currentStatus) {
if (args.mMultiPackageInstallParams != null) {
args.mMultiPackageInstallParams.tryProcessInstallRequest(args, currentStatus);
} else {
PackageInstalledInfo res = createPackageInstalledInfo(currentStatus);
processInstallRequestsAsync(
res.returnCode == PackageManager.INSTALL_SUCCEEDED,
Collections.singletonList(new InstallRequest(args, res)));
}
} // Queue up an async operation since the package installation may take a little while.
private void processInstallRequestsAsync(boolean success,
List<InstallRequest> installRequests) {
mHandler.post(() -> {
if (success) {
for (InstallRequest request : installRequests) {
安装前
request.args.doPreInstall(request.installResult.returnCode);
}
synchronized (mInstallLock) {
安装中
installPackagesTracedLI(installRequests);
}
for (InstallRequest request : installRequests) {
安装后
request.args.doPostInstall(
request.installResult.returnCode, request.installResult.uid);
}
}
for (InstallRequest request : installRequests) {
restoreAndPostInstall(request.args.user.getIdentifier(), request.installResult,
new PostInstallData(request.args, request.installResult, null));
}
});
} private PackageInstalledInfo createPackageInstalledInfo(
int currentStatus) {
PackageInstalledInfo res = new PackageInstalledInfo();
res.setReturnCode(currentStatus);
res.uid = -1;
res.pkg = null;
res.removedInfo = null;
return res;
} @GuardedBy({"mInstallLock", "mLock"})
private void installPackagesTracedLI(List<InstallRequest> requests) {
try {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "installPackages");
installPackagesLI(requests);
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
}
private void installPackagesLI(List<InstallRequest> requests) {
final Map<String, ScanResult> preparedScans = new ArrayMap<>(requests.size());
final Map<String, InstallArgs> installArgs = new ArrayMap<>(requests.size());
final Map<String, PackageInstalledInfo> installResults = new ArrayMap<>(requests.size());
final Map<String, PrepareResult> prepareResults = new ArrayMap<>(requests.size());
final Map<String, VersionInfo> versionInfos = new ArrayMap<>(requests.size());
final Map<String, PackageSetting> lastStaticSharedLibSettings =
new ArrayMap<>(requests.size());
final Map<String, Boolean> createdAppId = new ArrayMap<>(requests.size());
boolean success = false;
try {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "installPackagesLI");
for (InstallRequest request : requests) {
// TODO(b/109941548): remove this once we've pulled everything from it and into
// scan, reconcile or commit.
final PrepareResult prepareResult;
try {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "preparePackage");
prepareResult =
preparePackageLI(request.args, request.installResult);
} catch (PrepareFailure prepareFailure) {
request.installResult.setError(prepareFailure.error,
prepareFailure.getMessage());
request.installResult.origPackage = prepareFailure.conflictingPackage;
request.installResult.origPermission = prepareFailure.conflictingPermission;
return;
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
request.installResult.setReturnCode(PackageManager.INSTALL_SUCCEEDED);
request.installResult.installerPackageName =
request.args.installSource.installerPackageName;
final String packageName = prepareResult.packageToScan.getPackageName();
prepareResults.put(packageName, prepareResult);
installResults.put(packageName, request.installResult);
installArgs.put(packageName, request.args);
try {
final ScanResult result = scanPackageTracedLI(
prepareResult.packageToScan, prepareResult.parseFlags,
prepareResult.scanFlags, System.currentTimeMillis(),
request.args.user, request.args.abiOverride);
if (null != preparedScans.put(result.pkgSetting.pkg.getPackageName(), result)) {
request.installResult.setError(
PackageManager.INSTALL_FAILED_DUPLICATE_PACKAGE,
"Duplicate package " + result.pkgSetting.pkg.getPackageName()
+ " in multi-package install request.");
return;
}
createdAppId.put(packageName, optimisticallyRegisterAppId(result));
versionInfos.put(result.pkgSetting.pkg.getPackageName(),
getSettingsVersionForPackage(result.pkgSetting.pkg));
if (result.staticSharedLibraryInfo != null) {
final PackageSetting sharedLibLatestVersionSetting =
getSharedLibLatestVersionSetting(result);
if (sharedLibLatestVersionSetting != null) {
lastStaticSharedLibSettings.put(result.pkgSetting.pkg.getPackageName(),
sharedLibLatestVersionSetting);
}
}
} catch (PackageManagerException e) {
request.installResult.setError("Scanning Failed.", e);
return;
}
}
ReconcileRequest reconcileRequest = new ReconcileRequest(preparedScans, installArgs,
installResults,
prepareResults,
mSharedLibraries,
Collections.unmodifiableMap(mPackages), versionInfos,
lastStaticSharedLibSettings);
CommitRequest commitRequest = null;
synchronized (mLock) {
Map<String, ReconciledPackage> reconciledPackages;
try {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "reconcilePackages");
reconciledPackages = reconcilePackagesLocked(
reconcileRequest, mSettings.mKeySetManagerService);
} catch (ReconcileFailure e) {
for (InstallRequest request : requests) {
request.installResult.setError("Reconciliation failed...", e);
}
return;
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
try {
Trace.traceBegin(TRACE_TAG_PACKAGE_MANAGER, "commitPackages");
commitRequest = new CommitRequest(reconciledPackages,
mUserManager.getUserIds());
commitPackagesLocked(commitRequest);
success = true;
} finally {
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
}
executePostCommitSteps(commitRequest);
} finally {
if (success) {
for (InstallRequest request : requests) {
final InstallArgs args = request.args;
if (args.mDataLoaderType != DataLoaderType.INCREMENTAL) {
continue;
}
if (args.signingDetails.signatureSchemeVersion != SIGNING_BLOCK_V4) {
continue;
}
// For incremental installs, we bypass the verifier prior to install. Now
// that we know the package is valid, send a notice to the verifier with
// the root hash of the base.apk.
final String baseCodePath = request.installResult.pkg.getBaseCodePath();
final String[] splitCodePaths = request.installResult.pkg.getSplitCodePaths();
final Uri originUri = Uri.fromFile(args.origin.resolvedFile);
final int verificationId = mPendingVerificationToken++;
final String rootHashString = PackageManagerServiceUtils
.buildVerificationRootHashString(baseCodePath, splitCodePaths);
broadcastPackageVerified(verificationId, originUri,
PackageManager.VERIFICATION_ALLOW, rootHashString,
args.mDataLoaderType, args.getUser());
}
} else {
for (ScanResult result : preparedScans.values()) {
if (createdAppId.getOrDefault(result.request.parsedPackage.getPackageName(),
false)) {
cleanUpAppIdCreation(result);
}
}
// TODO(patb): create a more descriptive reason than unknown in future release
// mark all non-failure installs as UNKNOWN so we do not treat them as success
for (InstallRequest request : requests) {
if (request.installResult.freezer != null) {
request.installResult.freezer.close();
}
if (request.installResult.returnCode == PackageManager.INSTALL_SUCCEEDED) {
request.installResult.returnCode = PackageManager.INSTALL_UNKNOWN;
}
}
}
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
}
}executePostCommitSteps执行安装
installPackageLI方法的代码有将近500行，这里截取主要的部分，主要做了几件事：
- 创建PackageParser解析APK。
- 检查APK是否存在，如果存在就获取此前没被改名前的包名并在注释1处赋值给PackageParser.Package类型的pkg，在注释3处将标志位replace置为true表示是替换安装。
- 注释3处，如果Settings中保存有要安装的APK的信息，说明此前安装过该APK，则需要校验APK的签名信息，确保安全的进行替换。
- 在注释4处将临时文件重新命名，比如前面提到的/data/app/vmdl18300388.tmp/base.apk，重命名为/data/app/包名-1/base.apk。这个新命名的包名会带上一个数字后缀1，每次升级一个已有的App，这个数字会不断的累加。
- 系统APP的更新安装会有两个限制，一个是系统APP不能在SD卡上替换安装，另一个是系统APP不能被Instant App替换。
- 注释5处根据replace来做区分，如果是替换安装就会调用replacePackageLIF方法，其方法内部还会对系统APP和非系统APP进行区分处理，如果是新安装APK会调用installNewPackageLIF方法。
installNewPackageLIF主要做了以下3件事：
- 扫描APK，将APK的信息存储在PackageParser.Package类型的newPackage中，一个Package的信息包含了1个base APK以及0个或者多个split APK。
- 更新该APK对应的Settings信息，Settings用于保存所有包的动态设置。
- 如果安装成功就为新安装的应用程序准备数据，安装失败就删除APK。
安装APK的过程就讲到这里，就不再往下分析下去，有兴趣的同学可以接着深挖。
**4.总结 **
本文主要讲解了PMS是如何处理APK安装的，主要有几个步骤：
- PackageInstaller安装APK时会将APK的信息交由PMS处理，PMS通过向PackageHandler发送消息来驱动APK的复制和安装工作。
- PMS发送INIT_COPY和MCS_BOUND类型的消息，控制PackageHandler来绑定DefaultContainerService，完成复制APK等工作。
- 复制APK完成后，会开始进行安装APK的流程，包括安装前的检查、安装APK和安装后的收尾工作。
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